{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "08de61beab8a21c8e0b3906a97defda5f1f66ece"
            },
            {
              "fixed": "d0c5aa8dd38887714f1aad04236a3620b56a5e4e"
            },
            {
              "fixed": "e06b596fc4eb01936a2e5dccad17c946d660bab8"
            },
            {
              "fixed": "8ddf8de7e758f6888988467af9ffc8adf589fb16"
            },
            {
              "fixed": "d3225e6b9bd51ec177970a628fe4b11237ce87d5"
            },
            {
              "fixed": "7b18692c59afb8e5c364c8e3ac01e51dd6b52028"
            },
            {
              "fixed": "83f644ea92987c100b82d8481ae2230faeed3d34"
            },
            {
              "fixed": "ee836e820a40e2ca4da8af7310bff92d586772d4"
            },
            {
              "fixed": "eb2d16a7d599dc9d4df391b5e660df9949963786"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.21"
            },
            {
              "fixed": "5.10.253"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.203"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.168"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.131"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.80"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.21"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31515.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\naf_key: validate families in pfkey_send_migrate()\n\nsyzbot was able to trigger a crash in skb_put() [1]\n\nIssue is that pfkey_send_migrate() does not check old/new families,\nand that set_ipsecrequest() @family argument was truncated,\nthus possibly overfilling the skb.\n\nValidate families early, do not wait set_ipsecrequest().\n\n[1]\n\nskbuff: skb_over_panic: text:ffffffff8a752120 len:392 put:16 head:ffff88802a4ad040 data:ffff88802a4ad040 tail:0x188 end:0x180 dev:\u003cNULL\u003e\n kernel BUG at net/core/skbuff.c:214 !\nCall Trace:\n \u003cTASK\u003e\n  skb_over_panic net/core/skbuff.c:219 [inline]\n  skb_put+0x159/0x210 net/core/skbuff.c:2655\n  skb_put_zero include/linux/skbuff.h:2788 [inline]\n  set_ipsecrequest net/key/af_key.c:3532 [inline]\n  pfkey_send_migrate+0x1270/0x2e50 net/key/af_key.c:3636\n  km_migrate+0x155/0x260 net/xfrm/xfrm_state.c:2848\n  xfrm_migrate+0x2140/0x2450 net/xfrm/xfrm_policy.c:4705\n  xfrm_do_migrate+0x8ff/0xaa0 net/xfrm/xfrm_user.c:3150",
  "id": "CVE-2026-31515",
  "modified": "2026-07-08T05:36:08.305454630Z",
  "published": "2026-04-22T13:54:32.194Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7b18692c59afb8e5c364c8e3ac01e51dd6b52028"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/83f644ea92987c100b82d8481ae2230faeed3d34"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8ddf8de7e758f6888988467af9ffc8adf589fb16"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d0c5aa8dd38887714f1aad04236a3620b56a5e4e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d3225e6b9bd51ec177970a628fe4b11237ce87d5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e06b596fc4eb01936a2e5dccad17c946d660bab8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eb2d16a7d599dc9d4df391b5e660df9949963786"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ee836e820a40e2ca4da8af7310bff92d586772d4"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31515.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31515"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "summary": "af_key: validate families in pfkey_send_migrate()"
}